A Static-Error-Less Phase Detector for Delay Locked Loops

摘要

This paper presents a new phase detector circuit for a 30-phase 500MHz DLL. The new phase detector circuit solves the problem of dead zone in course of charge pump's switch transition and has advantages of a perfect li near PD with almost no static phase error which caused by current mismatch in the charge pump. The post-simulation results show that the proposed PD can detect the delay difference no less than 1ps, and RMS jitter of the DLL with the proposed phase detector decreased to 0.5629ps.